This is a fork of Gleitz's MIDI.js Soundfonts which is an amazing resource that collects lots of soundfonts and is amazing! Look at it!
However, it is very big to install inside another package. This package exists to give primarily orchestral instruments in pretty high quality for use in other packages, such as music21j, trying to keep the install to around 80MB as opposed to the 4GB+ of the Gleitz collection.
Note that the .ogg files are much higher quality and are used by every browser except Safari which does not have .ogg support. The mp3 versions are slowly being replaced by higher quality versions that are not exact matches but avoid the huge overtone problems found in the original versions.